JP2004145436A - Method and device for creating production plan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and device for creating a production plan making it possible to supply a plurality of substrates which the units of a subsequent process require, in such a manner as to keep in-work inventory at its minimum and adjust the faces of the substrates at the same time and immediately before the production of the subsequent process. <P>SOLUTION: The method for creating a production plan includes creating data including face adjustment information by which the lot information of units for a subsequent implementation process is pegged to the lot of the plurality of substrates needed for the units, and creating production order plan data based on this face adjustment information. This solves the problem with conventional production plan planning methods and devices wherein in-process inventory occurs at the end of the subsequent process because information on face adjustments during the subsequent process is not taken into account. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a production plan creation method for creating a production order plan in a mounting step of mounting electronic components on a printed circuit board, and an apparatus therefor.
[0002]
[Prior art]
In general, the production plan creator, while observing the delivery date and available date of delivery, sets the mounting device within the range of the device capacity of the mounting device used in the process, the constraints of the mounting device, and the constraints on the construction method. It automatically creates a production plan to achieve both a high operation rate and a reduction in manufacturing lead time.
[0003]
Hereinafter, a conventional production plan creation method will be described.
[0004]
FIG. 3 is a schematic configuration diagram of a conventional production and production apparatus in a mounting step of mounting an electronic component on a printed circuit board.
[0005]
In the figure, 1 is a central processing unit, 2 is a storage device for storing data, 3 is an input device for inputting information on a next process or a shipment plan to a customer, and 4 is a display device for displaying a result ( For example, a CRT display or a liquid crystal display device). Reference numeral 5 denotes a production instruction for processing the data created by the production sequence plan creating means 10 described later in the central processing unit 1 and instructing production.
[0006]
The production sequence planning data 9 is data created by the production sequence planning means 10 based on the shipping date / tact / device capability data 7. The plan data of whether or not to produce a unit corresponds. This production sequence planning means 10 is actually a software program.
[0007]
Hereinafter, an operation procedure of the production plan creation device having the above configuration will be described.
[0008]
First, the production order creator (user) inputs at least one of the shipping date / tact / device capability data 7 through the input device 3, and this data 7 is stored in the storage device 2. Then, the production sequence planning means 10 creates the production sequence planning data 9 based on the shipping date / tact / device capability data 7. At this time, the produced production sequence plan data 9 may be visually displayed on the display device 4.
[0009]
Further, based on the production sequence plan data 9, the production instruction 5 is printed on paper or output in an arbitrary format predetermined on an electronic medium. At this time, the production sequence plan creating means 10 determines the delivery date included in the shipping date / tact / device capability data 7, the production capability of each mounting device, and the tact time (the time required to produce one printed circuit board). The production sequence planning data 9 is created so that the production of the product is completed within the delivery date in consideration of the load multiplied by ()).
[0010]
FIG. 4 is a diagram illustrating a conventional production plan creation method in a mounting process of mounting an electronic component on a printed circuit board. As shown in these figures, in general, the production sequence planning method 10 has two methods, forward and backward.
[0011]
The former is a method of selecting an optimal lot that minimizes the switching loss from the lots that can be determined for the equipment at that time, in order from the start date, and formulates a plan. On the other hand, the backward is a method of selecting an optimal lot that minimizes the switching loss from the lots that can be determined for the equipment at that time in order from the delivery date and formulating the plan.
[0012]
As described above, in the conventional production plan creation method, a production sequence plan is drafted so that an optimal lot with the minimum switching loss can be selected, and the number of stocks is minimized.
[0013]
[Patent Document 1]
JP-A-7-178654
[Problems to be solved by the invention]
However, in the above-described conventional production plan creation method, since the switching efficiency is prioritized, the number of switching times is reduced, but the lead time becomes longer and the work-in-process inventory increases. become.
[0015]
FIG. 5 shows a case where a bottleneck is an intermediate work in the conventional production planning method in a mounting process of mounting electronic components on a printed circuit board. In the production work, when the work of the bottleneck is in the intermediate work, when the plan is made forward, the work-in-process stock is generated from the beginning to the middle. In addition, when the plan is made in the backward direction, the work-in-process stock is generated between the middle and the last.
[0016]
Furthermore, from the start date or the delivery date, the optimal lot that minimizes the switching loss is selected from among the lots that can be determined for the equipment at that time, and a plan is created. Since the information is not taken into account, a work-in-progress stock will be generated at the end of the process until all the substrates are completed.
[0017]
SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and enables production of a plurality of substrates required by a unit in a post-process with a minimum in-process inventory and at the same time immediately before production in a post-process. An object of the present invention is to provide a plan creation method and a device therefor.
[0018]
[Means for Solving the Problems]
In order to achieve the above object, a production plan creation method according to claim 1, wherein a lot alignment of a lot of a plurality of boards required for the unit and a lot of a plurality of substrates required for the unit in a post-process in a mounting process is provided. It is characterized by having data including information, and creating production sequence planning data based on the surface alignment information.
[0019]
Further, in the production plan creation method according to claim 2, after the backward planning, the bottleneck equipment is determined from the average of the operation rate of the equipment and the lead time of the lot, and the bottleneck equipment is forward-planned. By doing so, production sequence plan data is created.
[0020]
Furthermore, the production plan creation device described in claim 3 inputs the order data including the lot information of the unit of the post-process in the mounting process and the surface alignment information associated with the lot of a plurality of substrates required for the unit. An input device, a storage device that stores the order data, a display device that displays a production sequence plan and a result of creating data, and manages and controls the input device, the storage device, and the display device, and the storage device Having a central processing unit that determines the bottleneck facility from the average of the equipment operation rate and the lead time of the lot after planning the backward plan using the stored information, drafts the forward plan, and creates a production sequence plan Is desirable.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
The production plan creation method according to claim 1 of the present invention has data including surface alignment information that links lot information of a unit in a post-process in a mounting process with lots of a plurality of substrates required for the unit. A production sequence planning method for producing production sequence planning data based on the surface alignment information, wherein a plurality of substrates required by a unit in a subsequent process are simultaneously aligned and supplied immediately before production in a subsequent process. Has the effect of making it possible to
[0022]
Further, according to the production plan creation method of the present invention, after the backward planning, the bottleneck equipment is determined from the average of the operation rate of the equipment and the lead time of the lot, and the bottleneck equipment is forward-planned. This is a production plan creating method for creating production sequence plan data by making a plan, and has an effect of minimizing in-process inventory.
[0023]
Further, the production plan creation device according to claim 3 of the present invention is capable of processing order data including lot information of a unit in a post-process in a mounting process and surface alignment information associated with a lot of a plurality of substrates required for the unit. An input device for inputting, a storage device for storing the order data, a display device for displaying a production result of the production sequence plan, and a storage device for managing and controlling the input device, the storage device, and the display device; After the backward planning using the information stored in the equipment, a central processing unit that determines the bottleneck equipment from the average of the operation rate of the equipment and the lead time of the lot, creates a forward plan, and creates a production sequence plan. A production plan creation device that has a minimum number of in-process inventory of multiple boards required by a unit in the post-process, and simultaneously supplies the same substrates immediately before production in the post-process. An effect that realizes the production sequence planning system that enables Rukoto.
[0024]
An embodiment of the present invention will be described below with reference to FIGS.
[0025]
FIG. 1 is a schematic configuration diagram of a production plan creation device in a mounting process for mounting an electronic component on a printed circuit board according to an embodiment of the present invention.
[0026]
In FIG. 1, 1 is a central processing unit, 2 is a storage device for storing data, 3 is an input device for inputting information on the next process or shipping plan to a customer, and 4 is a display device for displaying the result (for example, CRT). Display or liquid crystal display device). Reference numeral 5 denotes a production instruction for processing data created by the production sequence plan creating means 6 described later in the central processing unit 1 and instructing production. The configuration of these hardware is the same as that of the conventional production plan creation device.
[0027]
The production sequence planning means 6 converts the shipment date / tact / device capability data 7, the lot of the unit in the post-process, and the lot of a plurality of substrates required for the unit into assembly lot data 8 which is link management information. Based on this, the production sequence plan data 9 is created. Further, the production sequence plan data 9 means plan data indicating which device should be used to produce each printed circuit board and when, and how many units will be produced. This production sequence plan creating means 6 is actually a software program.
[0028]
The production sequence plan data 9 of the present invention has the same data format as the production sequence plan data 9 of the conventional example, but is created based on the assembly lot data 8 unlike the conventional example.
[0029]
Hereinafter, an operation procedure of the production plan creation device having the above configuration will be described.
[0030]
First, the production order creator (user) inputs the shipping date / tact / device capability data 7 and the assembly lot data 8 through the input device 3. The input shipping date / tact / device capability data 7 and assembly lot data 8 are stored in the storage device 2. The production sequence planning means 6 creates production sequence plan data 9 based on the shipping date / tact / device capability data 7 and the assembly lot data 8. Further, the display device 4 plays a role of visually displaying the created production sequence plan data 9. At this time, based on the production sequence plan data 9, the production instruction 5 is printed on paper or output in an arbitrary format predetermined on an electronic medium.
[0031]
The production sequence plan creating means 6 multiplies the delivery date included in the shipping date / tact / device capability data 7, the production capability of each mounting device, and the tact time (the time required to produce one printed circuit board). The production sequence plan data 9 is created in consideration of the load, the assembly lot data 8 and other data so that the production of the product is completed within the delivery date.
[0032]
For example, when there is an assembly lot that requires a plurality of substrates to complete a product in the assembly process, information on the assembly lot and the corresponding substrate lot is input. The production sequence planner inputs from the input device 3 or from the electronic medium, and the input assembly lot data 8 is stored in the storage device 2.
[0033]
During the production sequence planning, if there are a plurality of lots that can be determined for the facility at a certain point in time during the production sequence planning, the production sequence plan creating means 6 selects the same substrate lot as the already allocated substrate lot. A plan is determined with priority, and production sequence plan data 9 is created.
[0034]
FIG. 2 shows another production plan creation method according to the present embodiment.
[0035]
In FIG. 2, the production sequence plan creation means 6 first produces the production sequence plan data 9 in a backward direction based on the delivery date. In the production sequence plan data 9, the bottleneck equipment is determined from the average of the equipment operation rate and the lot lead time, and thereafter, re-planning is performed forward.
[0036]
Regarding the determination of bottleneck equipment, the operation rate is determined for each equipment at the stage when the production sequence plan data 9 is created in the backward direction. In addition, the time from the start of production of the previous equipment to the start of production of the next equipment is obtained for each lot and each equipment, and the time is used as the lead time of the next equipment. Then, the lead time is averaged for each facility. For the bottleneck decision, prepare parameters for weighting the priority between the operation rate and the average lead time, and rank the degree of bottleneck of equipment based on the parameters, the operation rate, and the average lead time. Is determined as a bottleneck facility.
[0037]
As described above, it is possible to simultaneously supply a plurality of substrates required by the unit in the post-process with a minimum in-process inventory immediately before the production in the post-process.
[0038]
【The invention's effect】
As described above, according to the present invention, there is provided a production plan creating method and apparatus capable of simultaneously supplying a plurality of substrates required by a unit in a post-process with a minimum work-in-process and immediately before production in a post-process. it can.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a production plan creation device according to an embodiment of the present invention; FIG. 2 (a) is a plan diagram of a production plan creation method of a production plan creation method according to an embodiment of the present invention in which all operations are planned backward; FIG. 3 (b) is a diagram in which post-work is deleted due to bottleneck work. FIG. 3 (c) is a diagram in which the deleted work is drafted forward. FIG. 3 is a schematic configuration diagram of a conventional production sequence plan creation method. FIG. 5 (a) is a drawing of a production plan in a production sequence plan creation method, and FIG. 5 (b) is a drawing of a production plan determined in a backward direction.
In the conventional production sequence plan creation method, the production plan decision diagram (a) is drawn forward, and the diagram (b) is drawn backward.
REFERENCE SIGNS LIST 1 Central processing unit 2 Storage device 3 Input device 4 Display device 5 Production instruction 6 Production sequence plan creation means 7 Shipping date / tact / device capability data 8 Assembly lot data 9 Production sequence plan data

Claims (3)

It has data including surface alignment information linking lot information of a unit in a post-process in a mounting process and a lot of a plurality of substrates required for the unit, and creates production order planning data based on the surface alignment information. A production plan creation method characterized by the following. After backward planning, bottleneck equipment is determined from the average of the operation rate of the equipment and the lead time of the lot, and the production sequence plan data is created by performing forward planning on the bottleneck equipment. Production plan creation method. An input device for inputting order data including lot information of a unit in a post-process in a mounting process and lot alignment information required for the unit, and a storage device for storing the order data; A display device that displays the result of creating the order plan data, the input device, the storage device, and manages and controls the display device, and after planning the backward plan using the information stored in the storage device, A production plan creating apparatus, comprising: a central processing unit that determines a bottleneck facility from an average of an operation rate and a lot lead time, makes a forward plan, and creates a production sequence plan.

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